CHEMISTRY HIGH SCHOOL

How many atoms are in 0.075 mol of titanium?Proper keying of scientific notation:

N x 10^exp or N x 10e(exp)

examples: 5.6 x 10^-3 or 5.6 x 10e-3

Answers

Answer 1
Answer: n = 0.075 mol

N = n × Na = 0.075 mol × 6.02 × 10^23 mol^-1 = 0.4515 × 10^23 = 45.15 × 10^21 or 45.15 × 10e23

Related Questions

A substance that cannot be broken down into other substances by ordinary chemical procedures is a(n) __________ a) element b) compound c) isotope d) proton e) molecule
CO2 + H2 -> CO + H2O What is being oxidized?
Write a balanced equation for the dissolution of CaCO3? lable all phases too... So far I have CaCO3(aq)<-->Ca^2+(aq)+CO3^2-(aq) but that is wrong. Please help!!
When determining an element identity what is the most important Subatomic part to look at?
In what parts of your daily life might you need to calculate the percentage composition of something?

Need help on this
Question

Answers

Answer:

The answer is D

Joel weighs a basket containing 7 peaches.Each peach weigh 200g. How many kilograms does the basket weigh​

Answers

Answer:

Explanation:

1 kg is 1000 grams

1 peach is 200 grams

7 peaches are 200*7 = 1400 grams

Therefore the number of kg = 1400 grams // 1000 grams /kg

The number of kg = 1.4 kg.

Answer:

Explanation:

7 times 200 is 1400 grams but thats not the question it asks in kilo's so i got a converter and the correct answer is 1.4 kilograms

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Which phrase describes the molecular structure and properties of two solid forms of carbon, diamond and graphite?(1) the same molecular structures and the same properties(2) the same molecular structures and different properties
(3) different molecular structures and the same properties
(4) different molecular structures and different properties

Answers

Answer is: (4) different molecular structures and different properties.

Different forms of the same element that have different properties because of different atom arrangements are called allotropes.  

Carbon has many allotropes, but two most important are graphite and diamomd.  

Graphite has sp2 and diamond has sp3 hybridization of carbon atoms, because of that graphite conduct electricity and diamond not.  

In diamond carbon atoms are arranged in the face centered cubic crystal structure called a diamond lattice.  

Diamond has very strong covalent bonds between carbon atoms and because of that it has the highest hardness and thermal conductivity of any bulk substance.  
The answer is (4) different molecular structures and different properties. The graphite has the structure of layer and diamond has the structure of regular tetrahedron.

Which reaction occurs when hydrogen ions react with hydroxide ions to form water?A. substitution
B. saponification
C. ionization
D. neutralization

Answers

Answer: D. neutralization

Explanation:

1. Substitution reaction is defined as the reaction in which one atom replaces the other atom from the compound.

AB+C\rightarrow AC+B

2. Saponification is a reaction in which fatty acids are made to react with alkalis to form sodium salt of fatty acids called as soaps.

3. Ionization is a type of chemical reaction in which a substance ionizes when dissolved in water.

AB\rightarrow A^++B^-

4. Neutralization is a type of chemical reaction in which an acid reacts with base to produce salt and water.

BOH+HX\rightarrow BX+H_2O
The answer is D.This one is a bit tricky because it requires you to realize that H+ and OH- are, respectively, an acid and a base. That's why it's neutralization.

Imagine our class has discovered a new element and named it Berkmarium. Berkmarium is known to have 3 naturally occurring isotopes. In nature, 70% of the element is Berkmarium-95, 28% is Berkmarium-97, and 2% is Berkmarium-94. Which isotope will the average atomic mass of Berkmarum be closest to, and why? Support your answer with a calculation.

Answers

Answer:

Detail is given below.

Explanation:

Given data;

Abundance of Berkmarium-95 = 70%

Abundance of Berkmarium-97 = 28%

Abundance of Berkmarium-94 = 2%

Average atomic mass closer to which isotope = ?

Solution:

1st of all we will calculate the average atomic mass of Berkmarium.

Average atomic mass = (abundance of 1st isotope × its atomic mass) +(abundance of 2nd isotope × its atomic mass) + (abundance of 3rd isotope × its atomic mass) / 100

Average atomic mass  = (70×95)+(28×97)+(2×94) /100

Average atomic mass =  6650 + 2716+ 188 / 100

Average atomic mass= 9554 / 100

Average atomic mass = 95.54 amu

The average atomic mass is closer to the isotope Berkmarium-95  because it is present in abundance as compared to the other two isotope. So this isotope constitute most of the part of Berkmarium.

The depictions of ionic compounds do not show distinct compound units but rather a collection of ions in the ratio given by the formula. Explain how the drawing of NaCl both illustrates that the compound exists as a large collection of ions and that the ratio of sodium ions to chloride ions is 1-to-1 as indicated by the formula NaCl.

Answers

Answer:

The ionic compound NaCl has a Face Centered Cubic unit cell

The site for atoms are Face, center and Edges corner.

Effective number of atoms

Na+

1centers + 12edges x(1)/(4) = 4 Na+  

Cl-

6face x(1)/(2)  + (1)/(8) x8 corners = 4Cl-

This is just one unit cell effective atom, there are thousand's of such unit cells are combined to form one such structure of NaCl. The real formula of NaCl is Na4Cl4 but for simplicity we use empirical formula that is NaCl.
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CAN SOMEONE THATS GOOD AT CHEM PLEASE HELP ME?!?!I’LL GIVE 50 POINTS!!!AND A BRAINIEST!!!PLEASE I HAVE OTHER HW TO DO:(